.\" Copyright (c) 2011 Kai Wang
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.\" $Id: dwarf_start_macro_file.3 3963 2022-03-12 16:07:32Z jkoshy $
.\"
.Dd September 25, 2011
.Dt DWARF_START_MACRO_FILE 3
.Os
.Sh NAME
.Nm dwarf_start_macro_file
.Nd mark the start of a source file inclusion
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "int"
.Fo dwarf_start_macro_file
.Fa "Dwarf_P_Debug dbg"
.Fa "Dwarf_Unsigned lineno"
.Fa "Dwarf_Unsigned fileindex"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_start_macro_file
marks the start of a new source file inclusion.
.Pp
Argument
.Fa dbg
should reference a DWARF producer instance allocated using
.Xr dwarf_producer_init 3
or
.Xr dwarf_producer_init_b 3 .
.Pp
Argument
.Fa lineno
specifies the line number of the source line where the source
file inclusion occurs.
A value of zero is used to indicate the file for the compilation unit
source itself.
.Pp
Argument
.Fa fileindex
specifies the index of the source file that is being included.
Valid source file indices are those returned by
.Xr dwarf_add_file_decl 3 .
.Pp
If argument
.Fa err
is not
.Dv NULL ,
it will be used to store error information in case of an error.
.Sh RETURN VALUES
On success, function
.Fn dwarf_start_macro_file
returns
.Dv DW_DLV_OK .
In case of an error, function
.Fn dwarf_start_macro_file
returns
.Dv DW_DLV_ERROR
and sets the argument
.Fa err .
.Sh ERRORS
Function
.Fn dwarf_start_macro_file
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
Argument
.Fa dbg
was
.Dv NULL .
.It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of the
function.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_add_file_decl 3 ,
.Xr dwarf_def_macro 3 ,
.Xr dwarf_end_macro_file 3 ,
.Xr dwarf_producer_init 3 ,
.Xr dwarf_producer_init_b 3 ,
.Xr dwarf_undef_macro 3 ,
.Xr dwarf_vendor_ext 3
